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Fläkt malfunction

Fläkt ventilation unit making noise

Is your Fläkt ventilation unit or HRU (Heat Recovery Unit) making more noise than usual? A humming, grinding, rattling or squealing sound often indicates wear and tear of the motor, worn bearings, or contamination of the fan.

Problem Making noise
  • Humming or grinding sound
  • Vibrations or resonance
  • Motor overhaul often possible
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What do you notice?

  • The ventilation unit makes more noise than before.
  • A humming, grinding, rattling or squealing sound.
  • The sound increases at a higher ventilation setting.
  • Vibrations via wall, ceiling or ventilation ducts.

Possible causes

  • Worn bearings or rotating parts.
  • Contamination of fan or motor.
  • Imbalance of the fan wheel.
  • Wear of motor or mounting rubbers.

When is overhaul possible?

If the noise is caused by wear to the motor or bearings, overhaul is often an excellent solution. This usually means the complete ventilation unit or HRU does not need to be replaced.

Choose the right solution

Fläkt motor overhaul View repairs → More about Fläkt overhaul View overhaul page →

Read more about Fläkt

Also view our other information pages about Fläkt ventilation units, HRUs, parts, malfunctions and overhauls.

Fläkt ventilation units Main page of the Fläkt knowledge center Mechanical ventilation units Information about mechanical ventilation units and overhaul HRUs (Heat Recovery Units) Heat recovery and HRU systems Fläkt overhaul Everything about motor overhaul and repair Fläkt parts Motors, PCBs, sensors, filters and parts Fläkt making noise Noise, vibrations and wear Fläkt humming Constant hum or resonance Fläkt no longer spinning Motor does not start or respond Fläkt not extracting properly Poor extraction or moisture problems Fläkt bearings worn Grinding or squealing motor due to wear

Is your problem or model not listed?

Use our troubleshooting guide or parts finder. We are happy to help you find the right solution for your Fläkt ventilation system.

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